Melting and recrystallization kinetics of poly(butylene terephthalate). (27th January 2017)

• Record Type: Journal Article
• Authors: Furushima, Yoshitomo; Kumazawa, Sadanori; Umetsu, Hideyuki; Toda, Akihiko; Zhuravlev, Evgeny; Schick, Christoph
• Is Part Of: Polymer. Volume 109(2017)
• Page Start: 307
• Page End: 314
• Publication Date: 2017-01-27
• Subjects: Recrystallization kinetics -- Melting kinetics -- Polybutylene terephthalate; Polymers -- Periodicals; Polymerization -- Periodicals; Polymères -- Périodiques; Polymérisation -- Périodiques; 547.7
• DOI: 10.1016/j.polymer.2016.12.053
• Languages: English
• ISSNs: 0032-3861

Abstract

Abstract: Melting of original crystals and their recrystallization during heating were successfully separated for isothermally crystallized poly(butylene terephthalate) (PBT). The corresponding kinetics was determined and quantitatively discussed for a wide range of heating rates (0.1–100, 000 K s -1 ) using fast-scanning chip calorimetry (FSC) and differential scanning calorimetry (DSC). The double melting peaks observed on the FSC curves are assigned to the melting of original crystals (low-temperature peak) and recrystallized and/or reorganized crystals (high-temperature peak). Heating rate dependence of the degree of recrystallization has been evaluated and the kinetics was discussed on the basis of Ozawa's method. Compared with the melt-crystallization and cold-crystallization, recrystallization kinetics is the fastest process. This is because many crystal remnants, which do not transform into the isotropic melt, act as athermal nuclei, and accelerate recrystallization. Graphical abstract: Highlights: Heating measurements of fast scanning calorimetry and differential scanning calorimetry were carried out for polybutylene terephthalate. The double melting peaks observed on the FSC curves are assigned. Zero-enthalpy-production melting temperature was estimated from the analysis of superheating. Recrystallization and melting kinetics was discussed quantitatively on the basis of Ozawa method.